| // Copyright (C) 2009 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gerrit.sshd; |
| |
| import com.google.inject.Binding; |
| import com.google.inject.Inject; |
| import com.google.inject.Injector; |
| import com.google.inject.Provider; |
| import com.google.inject.TypeLiteral; |
| |
| import org.apache.sshd.server.Command; |
| |
| import java.lang.annotation.Annotation; |
| import java.util.Collections; |
| import java.util.LinkedHashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| /** |
| * Creates DispatchCommand using commands registered by {@link CommandModule}. |
| */ |
| public class DispatchCommandProvider implements Provider<DispatchCommand> { |
| @Inject |
| private Injector injector; |
| |
| @Inject |
| private DispatchCommand.Factory factory; |
| |
| private final String dispatcherName; |
| private final CommandName parent; |
| |
| private volatile Map<String, Provider<Command>> map; |
| |
| public DispatchCommandProvider(final CommandName cn) { |
| this(Commands.nameOf(cn), cn); |
| } |
| |
| public DispatchCommandProvider(final String dispatcherName, |
| final CommandName cn) { |
| this.dispatcherName = dispatcherName; |
| this.parent = cn; |
| } |
| |
| @Override |
| public DispatchCommand get() { |
| return factory.create(dispatcherName, getMap()); |
| } |
| |
| private Map<String, Provider<Command>> getMap() { |
| if (map == null) { |
| synchronized (this) { |
| if (map == null) { |
| map = createMap(); |
| } |
| } |
| } |
| return map; |
| } |
| |
| @SuppressWarnings("unchecked") |
| private Map<String, Provider<Command>> createMap() { |
| final Map<String, Provider<Command>> m = |
| new TreeMap<String, Provider<Command>>(); |
| |
| for (final Binding<?> b : allCommands()) { |
| final Annotation annotation = b.getKey().getAnnotation(); |
| if (annotation instanceof CommandName) { |
| final CommandName n = (CommandName) annotation; |
| if (!Commands.CMD_ROOT.equals(n) && Commands.isChild(parent, n)) { |
| m.put(n.value(), (Provider<Command>) b.getProvider()); |
| } |
| } |
| } |
| |
| return Collections.unmodifiableMap( |
| new LinkedHashMap<String, Provider<Command>>(m)); |
| } |
| |
| private static final TypeLiteral<Command> type = |
| new TypeLiteral<Command>() {}; |
| |
| private List<Binding<Command>> allCommands() { |
| return injector.findBindingsByType(type); |
| } |
| } |